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data is encrypted to SSL record level data and vice versa. The SSL record
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buffers containing SSL data that needs to be sent to the remote SSL.
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high-water limit is given, the low-water limit defaults to an
implementation-specific value less than or equal to the
high-water limit. Setting high to zero forces low to zero as
well, and causes pause_writing() to be called whenever the
buffer becomes non-empty. Setting low to zero causes
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